Air purifier



FIG. 1 is a perspective view of the air purifier of the present invention;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken line showing is included for the purpose of illustrating and forms no part of the claimed design. 

I claim the ornamental design of an air purifier, as shown and described. 